I had Literature of an European manufacturer, however i let a colleague borrow it and is lost. I don't remember the name ether.
Zwick a german manufacturer does tripple offset, Bray does double offset I didnt know a quadruple offset existed
Vanessa also makes a triple offset butterfly valve.
I'm having a hard time imagining how there could be four eccentric motions in a butterfly valve, given the number of moving parts.
I could imagine there being four physical eccentrics, arranged as two pairs, at extremes of the disc and shaft.
It is only six years I'm in the valve business, but I've never heard about Quadruple Offset valve design, me too.
Whatever it is, to me it sounds like a fancy mistake or a marketing invention without much technical meaning.

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